Because of this, the ITF proposes the use of larger tennis balls
which move slower and bounces higher making it easy to keep them inside the
court.

In 2002, ITF introduced balls 6% larger than regular tennis
balls to be used for leisure games. But the ITF also saw this as a solution to
having more rallies in professional tournaments.

Though aces in games have not yet increased since 2002, ITF
claims the average service speed is increasing which may prompt them to use
larger balls.

Senior tennis players who played using the larger balls disliked
the idea because larger balls may dull their
game. ITF also admits that using larger balls may tire players easily as they
exert greater effort to hit the balls.